California Code, Labor Code - LAB § 9158

(a) A registered security guard carrying a firearm in compliance with security guard firearms qualifications established in Sections 7583.2 to 7583.5, inclusive, of the Business and Professions Code, who is employed to provide security to the motion picture production and who, in the scope and the course of that employment, is at all times in possession and control of the firearm.

(b) A sworn peace officer, as defined in Chapter 4.5 (commencing with Section 830) of Title 3 of Part 2 of the Penal Code, or sworn federal law enforcement officer, who is authorized to carry a firearm in the course and scope of the officer's duties and who, in the scope and the course of their duties, is at all times in possession and control of the firearm.